Transient jump detection circuit for step-down voltage converter

Abstract

The invention provides a transient jump detection circuit for a step-down voltage converter, and belongs to the field of basic electronic circuits. The transient jump detection circuit comprises a filter module, a differential module and a comparison module; an input end of the filter module is connected with an output voltage of the step-down voltage converter, and an output end thereof is connected with an input end of the differential module; the differential module outputs voltage change information of the output voltage of the step-down voltage converter in the form of differential voltage; the comparison module includes a first comparator and a second comparator having opposite output polarities, wherein input signals of the first comparator and the second comparator are differentialvoltages output by the differential module; and according to output signals of the first comparator and the second comparator, the condition of the output voltage of the step-down voltage converter can be judged. According to the transient jump detection circuit for the step-down voltage converter provided by the invention, the load jump of the step-down voltage converter can be rapidly detected,and the stability, the working frequency or pole-zero location of an existing loop of the step-down voltage converter are not influenced, additional pins do not need to be added, and the applicationrange is wide.

Description

technical field [0001] The invention belongs to the field of basic electronic circuits, and in particular relates to the design of a transient jump detection circuit for a step-down voltage converter. Background technique [0002] In the system design of the step-down voltage converter (BUCK), in order to adjust the output voltage of the BUCK, except for the voltage converter in the hysteretic mode, the system generally adjusts the output voltage of the BUCK indirectly by adjusting the duty cycle. The system is stable and the duty cycle cannot change too quickly. However, the BUCK output voltage fluctuation caused by the load jump is essentially due to the fact that the output current of the system cannot follow the change of the load current well. [0003] For the transient jump of the step-down voltage converter in the existing system, in order to speed up the adjustment of the system output current, a zero point is generally introduced in the loop to speed up the loop re...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned problem that the traditional step-down voltage converter cannot detect and adapt to the transient jump in real time when the load is switched or the load jumps, the present invention proposes a transient jump detection circuit for the step-down voltage converter, On the basis of not affecting the loop characteristics and stability of the step-down voltage converter, it can detect the moment when the output voltage changes and the moment when the load current changes, so that it can be in the shortest time after the load current jumps. Loop regulation of the buck voltage converter with maximum duty cycle or minimum duty cycle, so that the buck voltage converter output current can follow the output current at the maximum speed, while adaptively according to the detected transient jump The timing of the control transient enhances the response time of the

Images